Locomotive spark-arrester



B. FISHE LOCOMOTIVE SPARK ARRESTER.

APPLICATION FILED FEB. 10, 1919.

1,3565201. Patented Oct-19,1920.

WITNESSES N VEN TOR.

I v I BY ATTORNEY.

I 7 Brezmrter ar/76 numeral 1 designates a cross bar or cross UNITED STATES BREWSTER FISHER, OF MOUNT VERNON, ILLINOIS.

LOCOMOTIVE SPARK-ARRESTER.

Specification of Letters Patent.

' Application filed February 10, 1919. Serial No. 276,144.

T 0 all to 7mm it may concern:

Be it known that I, BREWSTER FISHER, a citizen of the United States, residing at Mount Vernon, in thecounty of Jefierson and State of Illinois, have invented certain new and useful Improvements in Locomotive Spark-Arresters, of which the followin is a specification.

his invention relates to spark arresters,

sparks, but not so widely that they will be driven beyond the railways right of way.

A further object is to produce a spark arrester which will automatically extinguish the fire in the sparks, before spreading them.

Other objects will appear in the following specification and claim. Referring to the drawings,

Figure 1 is a central vertical section through the spark arrester and the upper portion of a stack, and

Figs. 2 and 3 are cross sections on the lines 22 and 3-3 of Fig. 1.

The stack S in the present instance is shown as of sheet metal with a bead B around its upper end. This is the usual construction of smokestacks now commonly employed on locomotives, but it is not inconsistent with my invention that the same could be applied to other types of stacks without departing from the principle involved, although details might necessarily be changed. 3

Coming now to the invention itself, the

piece disposed within the upper end ofthe stack S and preferably having its extremities bent at substantially right angles into lips 2 as best seen in Fig. 3. Its body stands on edge and is comparatively thin so that it will not interrupt the exhaust from the stack, although the body may be thickened between its upper and lower edges as indicated at 3 in Fig. 3, thereby imparting stiffness to the cross piece. Bolts 4 pass through the lips 2 and wall of the stack. These bolts pass also through the flat feet 5 at the lower although that is not necessary.

ends of two diametrically opposite posts 6 which are not seen in Fig.1, but which stand between the two posts therein illustrated and are of like construction. The posts shown have their feet 5 bolted as at 7 to the stack at diametrically opposite points. Above their fastening'bolts, all

posts are given crimps 8 soas to pass around the bead B if the stack .be provided with it, and with the object of adapting the attachment to stacks of various constructions, it

Patented Oct. 19, 1920..

PATENT. OFFICE.

is preferable that the lower ends of the posts be flattened out into such feet which are capable of being crimped as may be necessary, and aswill be clearly understood. The bodies of the posts may be round as shown, and their upper ends are preferably also flattened as indicated in Fig. 1.

The spark arrester proper consists of an inverted cone 10, herein shown as hollow I prefer that it shall be hollow for sake of lightness and economy in the metal consumed in its manufacture, and I would make it of the same metal as the stack, viz: sheet iron.

The apex 11 of thiscone is downward, and is continued into a stem 12 forked at its lower end at 13 where it passes astride the mid length of the cross piece 1 and the forkarms are bolted thereto as at 1 1. The base 15 of the cone is uppermost, and itis preferably carried over outward into what might be called a flange 16, directed obliquely.

downward. In other words, the sparks rising through the stack pass astride the cross piece 1 and up along the stem 12, then strike the inclined sides of the cone and finally strike the base 15 a considerable blow which extinguishes them so that they are no longer blazing lumps of coal which may do damage to adjacent property. Continuing around the under side of the base, they pass across the flange 16 and by it are deflected and directed outward and downward, so that they are delivered well beyond the upper end of the stack and on all sides. For supporting the upper end of the cone, the feet at the upper ends of the several posts 6 are preferably given each a compound bend or elbow l8, and their upper ends bolted as at 19 to the flange 16. spoken of bolts but of course rivets, screws, or other fastening devices might be applied if preferred. Only nine are necessary, the four feet at the extremities of the posts and one at the lower end of the stem 12. The

proportion of parts should be such that the spark arrester affords substantially no resistance to the upward movement of the sparks, but rather it is a wedge-shaped or conical element disposed in their path with its apex directed toward them for the purpose of diverging them from said path until they fall into the channeled base and are extinguished by impact. Beyond this point, the flange may be given such curvature as to throw them aside gently or otherwise, because by this time the particles are so far from the upper end of the stack S that no resistance is set up to the exhaust, and no back pressure occurs therein. Should the device wear or become broken, it is obvious it would be quite easy to repair parts, to replace them, or to put on an entirely new spark arrester in a few minutes.

The foregoing description and the drawings have reference to what may be considered the preferred or approved form of my invention. It is to be understood that I may make such changes in construction and arrangement and combination of parts, material, dimensions, et cetera, as may prove expedient and fall within scope of the appended claim.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is I A spark arrester for a cylindrical stack comprising an inverted torus of outer diameter substantially equal to the top of the stack, said torus pressed in its central portion to form a cone terminating in a leg, and means for supporting said leg internally of said stack, and means for supporting said torus on the periphery of said stack by legs joining with the periphery 01: said torus.

In testimony whereof I aflix my signature in presence of two witnesses.

BREWSTER FISHER.

1 lVitnesses OLLIE SnoHRns'r, CHAs. E. WIMBERLY. 

